gdb/expprint.c

   1 /* Print in infix form a struct expression.
   2
   3    Copyright (C) 1986, 1988-1989, 1991-2000, 2003, 2007-2012 Free
   4    Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "symtab.h"
  23 #include "gdbtypes.h"
  24 #include "expression.h"
  25 #include "value.h"
  26 #include "language.h"
  27 #include "parser-defs.h"
  28 #include "user-regs.h"          /* For user_reg_map_regnum_to_name.  */
  29 #include "target.h"
  30 #include "gdb_string.h"
  31 #include "block.h"
  32 #include "objfiles.h"
  33 #include "gdb_assert.h"
  34 #include "valprint.h"
  35
  36 #ifdef HAVE_CTYPE_H
  37 #include <ctype.h>
  38 #endif
  39
  40 void
  41 print_expression (struct expression *exp, struct ui_file *stream)
  42 {
  43   int pc = 0;
  44
  45   print_subexp (exp, &pc, stream, PREC_NULL);
  46 }
  47
  48 /* Print the subexpression of EXP that starts in position POS, on STREAM.
  49    PREC is the precedence of the surrounding operator;
  50    if the precedence of the main operator of this subexpression is less,
  51    parentheses are needed here.  */
  52
  53 void
  54 print_subexp (struct expression *exp, int *pos,
  55               struct ui_file *stream, enum precedence prec)
  56 {
  57   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  58 }
  59
  60 /* Standard implementation of print_subexp for use in language_defn
  61    vectors.  */
  62 void
  63 print_subexp_standard (struct expression *exp, int *pos,
  64                        struct ui_file *stream, enum precedence prec)
  65 {
  66   unsigned tem;
  67   const struct op_print *op_print_tab;
  68   int pc;
  69   unsigned nargs;
  70   char *op_str;
  71   int assign_modify = 0;
  72   enum exp_opcode opcode;
  73   enum precedence myprec = PREC_NULL;
  74   /* Set to 1 for a right-associative operator.  */
  75   int assoc = 0;
  76   struct value *val;
  77   char *tempstr = NULL;
  78
  79   op_print_tab = exp->language_defn->la_op_print_tab;
  80   pc = (*pos)++;
  81   opcode = exp->elts[pc].opcode;
  82   switch (opcode)
  83     {
  84       /* Common ops */
  85
  86     case OP_TYPE:
  87       (*pos) += 2;
  88       type_print (exp->elts[pc + 1].type, "", stream, 0);
  89       return;
  90
  91     case OP_SCOPE:
  92       myprec = PREC_PREFIX;
  93       assoc = 0;
  94       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  95       fputs_filtered ("::", stream);
  96       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  97       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  98       fputs_filtered (&exp->elts[pc + 3].string, stream);
  99       return;
 100
 101     case OP_LONG:
 102       {
 103         struct value_print_options opts;
 104
 105         get_raw_print_options (&opts);
 106         (*pos) += 3;
 107         value_print (value_from_longest (exp->elts[pc + 1].type,
 108                                          exp->elts[pc + 2].longconst),
 109                      stream, &opts);
 110       }
 111       return;
 112
 113     case OP_DOUBLE:
 114       {
 115         struct value_print_options opts;
 116
 117         get_raw_print_options (&opts);
 118         (*pos) += 3;
 119         value_print (value_from_double (exp->elts[pc + 1].type,
 120                                         exp->elts[pc + 2].doubleconst),
 121                      stream, &opts);
 122       }
 123       return;
 124
 125     case OP_VAR_VALUE:
 126       {
 127         struct block *b;
 128
 129         (*pos) += 3;
 130         b = exp->elts[pc + 1].block;
 131         if (b != NULL
 132             && BLOCK_FUNCTION (b) != NULL
 133             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
 134           {
 135             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
 136             fputs_filtered ("::", stream);
 137           }
 138         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
 139       }
 140       return;
 141
 142     case OP_VAR_ENTRY_VALUE:
 143       {
 144         (*pos) += 2;
 145         fprintf_filtered (stream, "%s@entry",
 146                           SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
 147       }
 148       return;
 149
 150     case OP_LAST:
 151       (*pos) += 2;
 152       fprintf_filtered (stream, "$%d",
 153                         longest_to_int (exp->elts[pc + 1].longconst));
 154       return;
 155
 156     case OP_REGISTER:
 157       {
 158         const char *name = &exp->elts[pc + 2].string;
 159
 160         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
 161         fprintf_filtered (stream, "$%s", name);
 162         return;
 163       }
 164
 165     case OP_BOOL:
 166       (*pos) += 2;
 167       fprintf_filtered (stream, "%s",
 168                         longest_to_int (exp->elts[pc + 1].longconst)
 169                         ? "TRUE" : "FALSE");
 170       return;
 171
 172     case OP_INTERNALVAR:
 173       (*pos) += 2;
 174       fprintf_filtered (stream, "$%s",
 175                         internalvar_name (exp->elts[pc + 1].internalvar));
 176       return;
 177
 178     case OP_FUNCALL:
 179       (*pos) += 2;
 180       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 181       print_subexp (exp, pos, stream, PREC_SUFFIX);
 182       fputs_filtered (" (", stream);
 183       for (tem = 0; tem < nargs; tem++)
 184         {
 185           if (tem != 0)
 186             fputs_filtered (", ", stream);
 187           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 188         }
 189       fputs_filtered (")", stream);
 190       return;
 191
 192     case OP_NAME:
 193       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 194       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 195       fputs_filtered (&exp->elts[pc + 2].string, stream);
 196       return;
 197
 198     case OP_STRING:
 199       {
 200         struct value_print_options opts;
 201
 202         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 203         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 204         /* LA_PRINT_STRING will print using the current repeat count threshold.
 205            If necessary, we can temporarily set it to zero, or pass it as an
 206            additional parameter to LA_PRINT_STRING.  -fnf */
 207         get_user_print_options (&opts);
 208         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 209                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 210       }
 211       return;
 212
 213     case OP_BITSTRING:
 214       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 215       (*pos)
 216         += 3 + BYTES_TO_EXP_ELEM ((nargs + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT);
 217       fprintf_unfiltered (stream, "B'<unimplemented>'");
 218       return;
 219
 220     case OP_OBJC_NSSTRING:      /* Objective-C Foundation Class
 221                                    NSString constant.  */
 222       {
 223         struct value_print_options opts;
 224
 225         nargs = longest_to_int (exp->elts[pc + 1].longconst);
 226         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
 227         fputs_filtered ("@\"", stream);
 228         get_user_print_options (&opts);
 229         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 230                          &exp->elts[pc + 2].string, nargs, NULL, 0, &opts);
 231         fputs_filtered ("\"", stream);
 232       }
 233       return;
 234
 235     case OP_OBJC_MSGCALL:
 236       {                 /* Objective C message (method) call.  */
 237         char *selector;
 238
 239         (*pos) += 3;
 240         nargs = longest_to_int (exp->elts[pc + 2].longconst);
 241         fprintf_unfiltered (stream, "[");
 242         print_subexp (exp, pos, stream, PREC_SUFFIX);
 243         if (0 == target_read_string (exp->elts[pc + 1].longconst,
 244                                      &selector, 1024, NULL))
 245           {
 246             error (_("bad selector"));
 247             return;
 248           }
 249         if (nargs)
 250           {
 251             char *s, *nextS;
 252
 253             s = alloca (strlen (selector) + 1);
 254             strcpy (s, selector);
 255             for (tem = 0; tem < nargs; tem++)
 256               {
 257                 nextS = strchr (s, ':');
 258                 gdb_assert (nextS);     /* Make sure we found ':'.  */
 259                 *nextS = '\0';
 260                 fprintf_unfiltered (stream, " %s: ", s);
 261                 s = nextS + 1;
 262                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 263               }
 264           }
 265         else
 266           {
 267             fprintf_unfiltered (stream, " %s", selector);
 268           }
 269         fprintf_unfiltered (stream, "]");
 270         /* "selector" was malloc'd by target_read_string.  Free it.  */
 271         xfree (selector);
 272         return;
 273       }
 274
 275     case OP_ARRAY:
 276       (*pos) += 3;
 277       nargs = longest_to_int (exp->elts[pc + 2].longconst);
 278       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
 279       nargs++;
 280       tem = 0;
 281       if (exp->elts[pc + 4].opcode == OP_LONG
 282           && exp->elts[pc + 5].type
 283              == builtin_type (exp->gdbarch)->builtin_char
 284           && exp->language_defn->la_language == language_c)
 285         {
 286           /* Attempt to print C character arrays using string syntax.
 287              Walk through the args, picking up one character from each
 288              of the OP_LONG expression elements.  If any array element
 289              does not match our expection of what we should find for
 290              a simple string, revert back to array printing.  Note that
 291              the last expression element is an explicit null terminator
 292              byte, which doesn't get printed.  */
 293           tempstr = alloca (nargs);
 294           pc += 4;
 295           while (tem < nargs)
 296             {
 297               if (exp->elts[pc].opcode != OP_LONG
 298                   || exp->elts[pc + 1].type
 299                      != builtin_type (exp->gdbarch)->builtin_char)
 300                 {
 301                   /* Not a simple array of char, use regular array
 302                      printing.  */
 303                   tem = 0;
 304                   break;
 305                 }
 306               else
 307                 {
 308                   tempstr[tem++] =
 309                     longest_to_int (exp->elts[pc + 2].longconst);
 310                   pc += 4;
 311                 }
 312             }
 313         }
 314       if (tem > 0)
 315         {
 316           struct value_print_options opts;
 317
 318           get_user_print_options (&opts);
 319           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
 320                            tempstr, nargs - 1, NULL, 0, &opts);
 321           (*pos) = pc;
 322         }
 323       else
 324         {
 325           fputs_filtered (" {", stream);
 326           for (tem = 0; tem < nargs; tem++)
 327             {
 328               if (tem != 0)
 329                 {
 330                   fputs_filtered (", ", stream);
 331                 }
 332               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 333             }
 334           fputs_filtered ("}", stream);
 335         }
 336       return;
 337
 338     case OP_LABELED:
 339       tem = longest_to_int (exp->elts[pc + 1].longconst);
 340       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 341       /* Gcc support both these syntaxes.  Unsure which is preferred.  */
 342 #if 1
 343       fputs_filtered (&exp->elts[pc + 2].string, stream);
 344       fputs_filtered (": ", stream);
 345 #else
 346       fputs_filtered (".", stream);
 347       fputs_filtered (&exp->elts[pc + 2].string, stream);
 348       fputs_filtered ("=", stream);
 349 #endif
 350       print_subexp (exp, pos, stream, PREC_SUFFIX);
 351       return;
 352
 353     case TERNOP_COND:
 354       if ((int) prec > (int) PREC_COMMA)
 355         fputs_filtered ("(", stream);
 356       /* Print the subexpressions, forcing parentheses
 357          around any binary operations within them.
 358          This is more parentheses than are strictly necessary,
 359          but it looks clearer.  */
 360       print_subexp (exp, pos, stream, PREC_HYPER);
 361       fputs_filtered (" ? ", stream);
 362       print_subexp (exp, pos, stream, PREC_HYPER);
 363       fputs_filtered (" : ", stream);
 364       print_subexp (exp, pos, stream, PREC_HYPER);
 365       if ((int) prec > (int) PREC_COMMA)
 366         fputs_filtered (")", stream);
 367       return;
 368
 369     case TERNOP_SLICE:
 370     case TERNOP_SLICE_COUNT:
 371       print_subexp (exp, pos, stream, PREC_SUFFIX);
 372       fputs_filtered ("(", stream);
 373       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 374       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
 375       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 376       fputs_filtered (")", stream);
 377       return;
 378
 379     case STRUCTOP_STRUCT:
 380       tem = longest_to_int (exp->elts[pc + 1].longconst);
 381       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 382       print_subexp (exp, pos, stream, PREC_SUFFIX);
 383       fputs_filtered (".", stream);
 384       fputs_filtered (&exp->elts[pc + 2].string, stream);
 385       return;
 386
 387       /* Will not occur for Modula-2.  */
 388     case STRUCTOP_PTR:
 389       tem = longest_to_int (exp->elts[pc + 1].longconst);
 390       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
 391       print_subexp (exp, pos, stream, PREC_SUFFIX);
 392       fputs_filtered ("->", stream);
 393       fputs_filtered (&exp->elts[pc + 2].string, stream);
 394       return;
 395
 396     case STRUCTOP_MEMBER:
 397       print_subexp (exp, pos, stream, PREC_SUFFIX);
 398       fputs_filtered (".*", stream);
 399       print_subexp (exp, pos, stream, PREC_SUFFIX);
 400       return;
 401
 402     case STRUCTOP_MPTR:
 403       print_subexp (exp, pos, stream, PREC_SUFFIX);
 404       fputs_filtered ("->*", stream);
 405       print_subexp (exp, pos, stream, PREC_SUFFIX);
 406       return;
 407
 408     case BINOP_SUBSCRIPT:
 409       print_subexp (exp, pos, stream, PREC_SUFFIX);
 410       fputs_filtered ("[", stream);
 411       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 412       fputs_filtered ("]", stream);
 413       return;
 414
 415     case UNOP_POSTINCREMENT:
 416       print_subexp (exp, pos, stream, PREC_SUFFIX);
 417       fputs_filtered ("++", stream);
 418       return;
 419
 420     case UNOP_POSTDECREMENT:
 421       print_subexp (exp, pos, stream, PREC_SUFFIX);
 422       fputs_filtered ("--", stream);
 423       return;
 424
 425     case UNOP_CAST:
 426       (*pos) += 2;
 427       if ((int) prec > (int) PREC_PREFIX)
 428         fputs_filtered ("(", stream);
 429       fputs_filtered ("(", stream);
 430       type_print (exp->elts[pc + 1].type, "", stream, 0);
 431       fputs_filtered (") ", stream);
 432       print_subexp (exp, pos, stream, PREC_PREFIX);
 433       if ((int) prec > (int) PREC_PREFIX)
 434         fputs_filtered (")", stream);
 435       return;
 436
 437     case UNOP_CAST_TYPE:
 438       if ((int) prec > (int) PREC_PREFIX)
 439         fputs_filtered ("(", stream);
 440       fputs_filtered ("(", stream);
 441       print_subexp (exp, pos, stream, PREC_PREFIX);
 442       fputs_filtered (") ", stream);
 443       print_subexp (exp, pos, stream, PREC_PREFIX);
 444       if ((int) prec > (int) PREC_PREFIX)
 445         fputs_filtered (")", stream);
 446       return;
 447
 448     case UNOP_DYNAMIC_CAST:
 449     case UNOP_REINTERPRET_CAST:
 450       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
 451                       : "reinterpret_cast", stream);
 452       fputs_filtered ("<", stream);
 453       print_subexp (exp, pos, stream, PREC_PREFIX);
 454       fputs_filtered ("> (", stream);
 455       print_subexp (exp, pos, stream, PREC_PREFIX);
 456       fputs_filtered (")", stream);
 457       return;
 458
 459     case UNOP_MEMVAL:
 460       (*pos) += 2;
 461       if ((int) prec > (int) PREC_PREFIX)
 462         fputs_filtered ("(", stream);
 463       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
 464           && exp->elts[pc + 3].opcode == OP_LONG)
 465         {
 466           struct value_print_options opts;
 467
 468           /* We have a minimal symbol fn, probably.  It's encoded
 469              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
 470              Swallow the OP_LONG (including both its opcodes); ignore
 471              its type; print the value in the type of the MEMVAL.  */
 472           (*pos) += 4;
 473           val = value_at_lazy (exp->elts[pc + 1].type,
 474                                (CORE_ADDR) exp->elts[pc + 5].longconst);
 475           get_raw_print_options (&opts);
 476           value_print (val, stream, &opts);
 477         }
 478       else
 479         {
 480           fputs_filtered ("{", stream);
 481           type_print (exp->elts[pc + 1].type, "", stream, 0);
 482           fputs_filtered ("} ", stream);
 483           print_subexp (exp, pos, stream, PREC_PREFIX);
 484         }
 485       if ((int) prec > (int) PREC_PREFIX)
 486         fputs_filtered (")", stream);
 487       return;
 488
 489     case UNOP_MEMVAL_TYPE:
 490       if ((int) prec > (int) PREC_PREFIX)
 491         fputs_filtered ("(", stream);
 492       fputs_filtered ("{", stream);
 493       print_subexp (exp, pos, stream, PREC_PREFIX);
 494       fputs_filtered ("} ", stream);
 495       print_subexp (exp, pos, stream, PREC_PREFIX);
 496       if ((int) prec > (int) PREC_PREFIX)
 497         fputs_filtered (")", stream);
 498       return;
 499
 500     case UNOP_MEMVAL_TLS:
 501       (*pos) += 3;
 502       if ((int) prec > (int) PREC_PREFIX)
 503         fputs_filtered ("(", stream);
 504       fputs_filtered ("{", stream);
 505       type_print (exp->elts[pc + 2].type, "", stream, 0);
 506       fputs_filtered ("} ", stream);
 507       print_subexp (exp, pos, stream, PREC_PREFIX);
 508       if ((int) prec > (int) PREC_PREFIX)
 509         fputs_filtered (")", stream);
 510       return;
 511
 512     case BINOP_ASSIGN_MODIFY:
 513       opcode = exp->elts[pc + 1].opcode;
 514       (*pos) += 2;
 515       myprec = PREC_ASSIGN;
 516       assoc = 1;
 517       assign_modify = 1;
 518       op_str = "???";
 519       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 520         if (op_print_tab[tem].opcode == opcode)
 521           {
 522             op_str = op_print_tab[tem].string;
 523             break;
 524           }
 525       if (op_print_tab[tem].opcode != opcode)
 526         /* Not found; don't try to keep going because we don't know how
 527            to interpret further elements.  */
 528         error (_("Invalid expression"));
 529       break;
 530
 531       /* C++ ops */
 532
 533     case OP_THIS:
 534       ++(*pos);
 535       if (exp->language_defn->la_name_of_this)
 536         fputs_filtered (exp->language_defn->la_name_of_this, stream);
 537       else
 538         fprintf_filtered (stream, _("<language %s has no 'this'>"),
 539                           exp->language_defn->la_name);
 540       return;
 541
 542       /* Modula-2 ops */
 543
 544     case MULTI_SUBSCRIPT:
 545       (*pos) += 2;
 546       nargs = longest_to_int (exp->elts[pc + 1].longconst);
 547       print_subexp (exp, pos, stream, PREC_SUFFIX);
 548       fprintf_unfiltered (stream, " [");
 549       for (tem = 0; tem < nargs; tem++)
 550         {
 551           if (tem != 0)
 552             fprintf_unfiltered (stream, ", ");
 553           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
 554         }
 555       fprintf_unfiltered (stream, "]");
 556       return;
 557
 558     case BINOP_VAL:
 559       (*pos) += 2;
 560       fprintf_unfiltered (stream, "VAL(");
 561       type_print (exp->elts[pc + 1].type, "", stream, 0);
 562       fprintf_unfiltered (stream, ",");
 563       print_subexp (exp, pos, stream, PREC_PREFIX);
 564       fprintf_unfiltered (stream, ")");
 565       return;
 566
 567     case TYPE_INSTANCE:
 568       {
 569         LONGEST count = exp->elts[pc + 1].longconst;
 570
 571         /* The COUNT.  */
 572         (*pos)++;
 573         fputs_unfiltered ("TypesInstance(", stream);
 574         while (count-- > 0)
 575           {
 576             type_print (exp->elts[(*pos)++].type, "", stream, 0);
 577             if (count > 0)
 578               fputs_unfiltered (",", stream);
 579           }
 580         fputs_unfiltered (",", stream);
 581         /* Ending COUNT and ending TYPE_INSTANCE.  */
 582         (*pos) += 2;
 583         print_subexp (exp, pos, stream, PREC_PREFIX);
 584         fputs_unfiltered (")", stream);
 585         return;
 586       }
 587
 588       /* Default ops */
 589
 590     default:
 591       op_str = "???";
 592       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 593         if (op_print_tab[tem].opcode == opcode)
 594           {
 595             op_str = op_print_tab[tem].string;
 596             myprec = op_print_tab[tem].precedence;
 597             assoc = op_print_tab[tem].right_assoc;
 598             break;
 599           }
 600       if (op_print_tab[tem].opcode != opcode)
 601         /* Not found; don't try to keep going because we don't know how
 602            to interpret further elements.  For example, this happens
 603            if opcode is OP_TYPE.  */
 604         error (_("Invalid expression"));
 605     }
 606
 607   /* Note that PREC_BUILTIN will always emit parentheses.  */
 608   if ((int) myprec < (int) prec)
 609     fputs_filtered ("(", stream);
 610   if ((int) opcode > (int) BINOP_END)
 611     {
 612       if (assoc)
 613         {
 614           /* Unary postfix operator.  */
 615           print_subexp (exp, pos, stream, PREC_SUFFIX);
 616           fputs_filtered (op_str, stream);
 617         }
 618       else
 619         {
 620           /* Unary prefix operator.  */
 621           fputs_filtered (op_str, stream);
 622           if (myprec == PREC_BUILTIN_FUNCTION)
 623             fputs_filtered ("(", stream);
 624           print_subexp (exp, pos, stream, PREC_PREFIX);
 625           if (myprec == PREC_BUILTIN_FUNCTION)
 626             fputs_filtered (")", stream);
 627         }
 628     }
 629   else
 630     {
 631       /* Binary operator.  */
 632       /* Print left operand.
 633          If operator is right-associative,
 634          increment precedence for this operand.  */
 635       print_subexp (exp, pos, stream,
 636                     (enum precedence) ((int) myprec + assoc));
 637       /* Print the operator itself.  */
 638       if (assign_modify)
 639         fprintf_filtered (stream, " %s= ", op_str);
 640       else if (op_str[0] == ',')
 641         fprintf_filtered (stream, "%s ", op_str);
 642       else
 643         fprintf_filtered (stream, " %s ", op_str);
 644       /* Print right operand.
 645          If operator is left-associative,
 646          increment precedence for this operand.  */
 647       print_subexp (exp, pos, stream,
 648                     (enum precedence) ((int) myprec + !assoc));
 649     }
 650
 651   if ((int) myprec < (int) prec)
 652     fputs_filtered (")", stream);
 653 }
 654
 655 /* Return the operator corresponding to opcode OP as
 656    a string.   NULL indicates that the opcode was not found in the
 657    current language table.  */
 658 char *
 659 op_string (enum exp_opcode op)
 660 {
 661   int tem;
 662   const struct op_print *op_print_tab;
 663
 664   op_print_tab = current_language->la_op_print_tab;
 665   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
 666     if (op_print_tab[tem].opcode == op)
 667       return op_print_tab[tem].string;
 668   return NULL;
 669 }
 670
 671 /* Support for dumping the raw data from expressions in a human readable
 672    form.  */
 673
 674 static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
 675
 676 /* Name for OPCODE, when it appears in expression EXP.  */
 677
 678 char *
 679 op_name (struct expression *exp, enum exp_opcode opcode)
 680 {
 681   return exp->language_defn->la_exp_desc->op_name (opcode);
 682 }
 683
 684 /* Default name for the standard operator OPCODE (i.e., one defined in
 685    the definition of enum exp_opcode).  */
 686
 687 char *
 688 op_name_standard (enum exp_opcode opcode)
 689 {
 690   switch (opcode)
 691     {
 692     default:
 693       {
 694         static char buf[30];
 695
 696         sprintf (buf, "<unknown %d>", opcode);
 697         return buf;
 698       }
 699 #define OP(name)        \
 700     case name:          \
 701       return #name ;
 702 #include "std-operator.def"
 703 #undef OP
 704     }
 705 }
 706
 707 /* Print a raw dump of expression EXP to STREAM.
 708    NOTE, if non-NULL, is printed as extra explanatory text.  */
 709
 710 void
 711 dump_raw_expression (struct expression *exp, struct ui_file *stream,
 712                      char *note)
 713 {
 714   int elt;
 715   char *opcode_name;
 716   char *eltscan;
 717   int eltsize;
 718
 719   fprintf_filtered (stream, "Dump of expression @ ");
 720   gdb_print_host_address (exp, stream);
 721   if (note)
 722     fprintf_filtered (stream, ", %s:", note);
 723   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
 724                     exp->language_defn->la_name, exp->nelts,
 725                     (long) sizeof (union exp_element));
 726   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
 727                     "Hex Value", "String Value");
 728   for (elt = 0; elt < exp->nelts; elt++)
 729     {
 730       fprintf_filtered (stream, "\t%5d  ", elt);
 731       opcode_name = op_name (exp, exp->elts[elt].opcode);
 732
 733       fprintf_filtered (stream, "%20s  ", opcode_name);
 734       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
 735       fprintf_filtered (stream, "  ");
 736
 737       for (eltscan = (char *) &exp->elts[elt],
 738            eltsize = sizeof (union exp_element);
 739            eltsize-- > 0;
 740            eltscan++)
 741         {
 742           fprintf_filtered (stream, "%c",
 743                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
 744         }
 745       fprintf_filtered (stream, "\n");
 746     }
 747 }
 748
 749 /* Dump the subexpression of prefix expression EXP whose operator is at
 750    position ELT onto STREAM.  Returns the position of the next
 751    subexpression in EXP.  */
 752
 753 int
 754 dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
 755 {
 756   static int indent = 0;
 757   int i;
 758
 759   fprintf_filtered (stream, "\n");
 760   fprintf_filtered (stream, "\t%5d  ", elt);
 761
 762   for (i = 1; i <= indent; i++)
 763     fprintf_filtered (stream, " ");
 764   indent += 2;
 765
 766   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));
 767
 768   elt = dump_subexp_body (exp, stream, elt);
 769
 770   indent -= 2;
 771
 772   return elt;
 773 }
 774
 775 /* Dump the operands of prefix expression EXP whose opcode is at
 776    position ELT onto STREAM.  Returns the position of the next
 777    subexpression in EXP.  */
 778
 779 static int
 780 dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
 781 {
 782   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
 783 }
 784
 785 /* Default value for subexp_body in exp_descriptor vector.  */
 786
 787 int
 788 dump_subexp_body_standard (struct expression *exp,
 789                            struct ui_file *stream, int elt)
 790 {
 791   int opcode = exp->elts[elt++].opcode;
 792
 793   switch (opcode)
 794     {
 795     case TERNOP_COND:
 796     case TERNOP_SLICE:
 797     case TERNOP_SLICE_COUNT:
 798       elt = dump_subexp (exp, stream, elt);
 799       /* FALL THROUGH */
 800     case BINOP_ADD:
 801     case BINOP_SUB:
 802     case BINOP_MUL:
 803     case BINOP_DIV:
 804     case BINOP_REM:
 805     case BINOP_MOD:
 806     case BINOP_LSH:
 807     case BINOP_RSH:
 808     case BINOP_LOGICAL_AND:
 809     case BINOP_LOGICAL_OR:
 810     case BINOP_BITWISE_AND:
 811     case BINOP_BITWISE_IOR:
 812     case BINOP_BITWISE_XOR:
 813     case BINOP_EQUAL:
 814     case BINOP_NOTEQUAL:
 815     case BINOP_LESS:
 816     case BINOP_GTR:
 817     case BINOP_LEQ:
 818     case BINOP_GEQ:
 819     case BINOP_REPEAT:
 820     case BINOP_ASSIGN:
 821     case BINOP_COMMA:
 822     case BINOP_SUBSCRIPT:
 823     case BINOP_EXP:
 824     case BINOP_MIN:
 825     case BINOP_MAX:
 826     case BINOP_INTDIV:
 827     case BINOP_ASSIGN_MODIFY:
 828     case BINOP_VAL:
 829     case BINOP_CONCAT:
 830     case BINOP_IN:
 831     case BINOP_RANGE:
 832     case BINOP_END:
 833     case STRUCTOP_MEMBER:
 834     case STRUCTOP_MPTR:
 835       elt = dump_subexp (exp, stream, elt);
 836       /* FALL THROUGH */
 837     case UNOP_NEG:
 838     case UNOP_LOGICAL_NOT:
 839     case UNOP_COMPLEMENT:
 840     case UNOP_IND:
 841     case UNOP_ADDR:
 842     case UNOP_PREINCREMENT:
 843     case UNOP_POSTINCREMENT:
 844     case UNOP_PREDECREMENT:
 845     case UNOP_POSTDECREMENT:
 846     case UNOP_SIZEOF:
 847     case UNOP_PLUS:
 848     case UNOP_CAP:
 849     case UNOP_CHR:
 850     case UNOP_ORD:
 851     case UNOP_ABS:
 852     case UNOP_FLOAT:
 853     case UNOP_HIGH:
 854     case UNOP_MAX:
 855     case UNOP_MIN:
 856     case UNOP_ODD:
 857     case UNOP_TRUNC:
 858       elt = dump_subexp (exp, stream, elt);
 859       break;
 860     case OP_LONG:
 861       fprintf_filtered (stream, "Type @");
 862       gdb_print_host_address (exp->elts[elt].type, stream);
 863       fprintf_filtered (stream, " (");
 864       type_print (exp->elts[elt].type, NULL, stream, 0);
 865       fprintf_filtered (stream, "), value %ld (0x%lx)",
 866                         (long) exp->elts[elt + 1].longconst,
 867                         (long) exp->elts[elt + 1].longconst);
 868       elt += 3;
 869       break;
 870     case OP_DOUBLE:
 871       fprintf_filtered (stream, "Type @");
 872       gdb_print_host_address (exp->elts[elt].type, stream);
 873       fprintf_filtered (stream, " (");
 874       type_print (exp->elts[elt].type, NULL, stream, 0);
 875       fprintf_filtered (stream, "), value %g",
 876                         (double) exp->elts[elt + 1].doubleconst);
 877       elt += 3;
 878       break;
 879     case OP_VAR_VALUE:
 880       fprintf_filtered (stream, "Block @");
 881       gdb_print_host_address (exp->elts[elt].block, stream);
 882       fprintf_filtered (stream, ", symbol @");
 883       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
 884       fprintf_filtered (stream, " (%s)",
 885                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
 886       elt += 3;
 887       break;
 888     case OP_VAR_ENTRY_VALUE:
 889       fprintf_filtered (stream, "Entry value of symbol @");
 890       gdb_print_host_address (exp->elts[elt].symbol, stream);
 891       fprintf_filtered (stream, " (%s)",
 892                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
 893       elt += 2;
 894       break;
 895     case OP_LAST:
 896       fprintf_filtered (stream, "History element %ld",
 897                         (long) exp->elts[elt].longconst);
 898       elt += 2;
 899       break;
 900     case OP_REGISTER:
 901       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
 902       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
 903       break;
 904     case OP_INTERNALVAR:
 905       fprintf_filtered (stream, "Internal var @");
 906       gdb_print_host_address (exp->elts[elt].internalvar, stream);
 907       fprintf_filtered (stream, " (%s)",
 908                         internalvar_name (exp->elts[elt].internalvar));
 909       elt += 2;
 910       break;
 911     case OP_FUNCALL:
 912       {
 913         int i, nargs;
 914
 915         nargs = longest_to_int (exp->elts[elt].longconst);
 916
 917         fprintf_filtered (stream, "Number of args: %d", nargs);
 918         elt += 2;
 919
 920         for (i = 1; i <= nargs + 1; i++)
 921           elt = dump_subexp (exp, stream, elt);
 922       }
 923       break;
 924     case OP_ARRAY:
 925       {
 926         int lower, upper;
 927         int i;
 928
 929         lower = longest_to_int (exp->elts[elt].longconst);
 930         upper = longest_to_int (exp->elts[elt + 1].longconst);
 931
 932         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
 933         elt += 3;
 934
 935         for (i = 1; i <= upper - lower + 1; i++)
 936           elt = dump_subexp (exp, stream, elt);
 937       }
 938       break;
 939     case UNOP_DYNAMIC_CAST:
 940     case UNOP_REINTERPRET_CAST:
 941     case UNOP_CAST_TYPE:
 942     case UNOP_MEMVAL_TYPE:
 943       fprintf_filtered (stream, " (");
 944       elt = dump_subexp (exp, stream, elt);
 945       fprintf_filtered (stream, ")");
 946       elt = dump_subexp (exp, stream, elt);
 947       break;
 948     case UNOP_MEMVAL:
 949     case UNOP_CAST:
 950       fprintf_filtered (stream, "Type @");
 951       gdb_print_host_address (exp->elts[elt].type, stream);
 952       fprintf_filtered (stream, " (");
 953       type_print (exp->elts[elt].type, NULL, stream, 0);
 954       fprintf_filtered (stream, ")");
 955       elt = dump_subexp (exp, stream, elt + 2);
 956       break;
 957     case UNOP_MEMVAL_TLS:
 958       fprintf_filtered (stream, "TLS type @");
 959       gdb_print_host_address (exp->elts[elt + 1].type, stream);
 960       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
 961                         (exp->elts[elt].objfile == NULL ? "(null)"
 962                          : exp->elts[elt].objfile->name));
 963       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
 964       fprintf_filtered (stream, ")");
 965       elt = dump_subexp (exp, stream, elt + 3);
 966       break;
 967     case OP_TYPE:
 968       fprintf_filtered (stream, "Type @");
 969       gdb_print_host_address (exp->elts[elt].type, stream);
 970       fprintf_filtered (stream, " (");
 971       type_print (exp->elts[elt].type, NULL, stream, 0);
 972       fprintf_filtered (stream, ")");
 973       elt += 2;
 974       break;
 975     case OP_TYPEOF:
 976     case OP_DECLTYPE:
 977       fprintf_filtered (stream, "Typeof (");
 978       elt = dump_subexp (exp, stream, elt);
 979       fprintf_filtered (stream, ")");
 980       break;
 981     case STRUCTOP_STRUCT:
 982     case STRUCTOP_PTR:
 983       {
 984         char *elem_name;
 985         int len;
 986
 987         len = longest_to_int (exp->elts[elt].longconst);
 988         elem_name = &exp->elts[elt + 1].string;
 989
 990         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
 991         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
 992       }
 993       break;
 994     case OP_SCOPE:
 995       {
 996         char *elem_name;
 997         int len;
 998
 999         fprintf_filtered (stream, "Type @");
1000         gdb_print_host_address (exp->elts[elt].type, stream);
1001         fprintf_filtered (stream, " (");
1002         type_print (exp->elts[elt].type, NULL, stream, 0);
1003         fprintf_filtered (stream, ") ");
1004
1005         len = longest_to_int (exp->elts[elt + 1].longconst);
1006         elem_name = &exp->elts[elt + 2].string;
1007
1008         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
1009         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
1010       }
1011       break;
1012     case TYPE_INSTANCE:
1013       {
1014         LONGEST len;
1015
1016         len = exp->elts[elt++].longconst;
1017         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
1018         while (len-- > 0)
1019           {
1020             fprintf_filtered (stream, "Type @");
1021             gdb_print_host_address (exp->elts[elt].type, stream);
1022             fprintf_filtered (stream, " (");
1023             type_print (exp->elts[elt].type, NULL, stream, 0);
1024             fprintf_filtered (stream, ")");
1025             elt++;
1026             if (len > 0)
1027               fputs_filtered (", ", stream);
1028           }
1029         /* Ending LEN and ending TYPE_INSTANCE.  */
1030         elt += 2;
1031         elt = dump_subexp (exp, stream, elt);
1032       }
1033       break;
1034     default:
1035     case OP_NULL:
1036     case MULTI_SUBSCRIPT:
1037     case OP_F77_UNDETERMINED_ARGLIST:
1038     case OP_COMPLEX:
1039     case OP_STRING:
1040     case OP_BITSTRING:
1041     case OP_BOOL:
1042     case OP_M2_STRING:
1043     case OP_THIS:
1044     case OP_LABELED:
1045     case OP_NAME:
1046       fprintf_filtered (stream, "Unknown format");
1047     }
1048
1049   return elt;
1050 }
1051
1052 void
1053 dump_prefix_expression (struct expression *exp, struct ui_file *stream)
1054 {
1055   int elt;
1056
1057   fprintf_filtered (stream, "Dump of expression @ ");
1058   gdb_print_host_address (exp, stream);
1059   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
1060   print_expression (exp, stream);
1061   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
1062                     exp->language_defn->la_name, exp->nelts,
1063                     (long) sizeof (union exp_element));
1064   fputs_filtered ("\n", stream);
1065
1066   for (elt = 0; elt < exp->nelts;)
1067     elt = dump_subexp (exp, stream, elt);
1068   fputs_filtered ("\n", stream);
1069 }